[ATM] Lyot Plate

[Dale Eason]

Just for the sake of discussion as I would never try
it myself using a soot covered filter but the soot
filter causes phase contrast images to be very yellow.
 It could be that the soot scatters the blue and thus
ultraviolet frequencies.  Perhaps that is why it can
be used visually safely if it really can.

I don't know.

Dale

--- Donald Good <donald.good at comcast.net> wrote:

> One comment: The web page below makes a side comment
> that applying soot to a
> glass plate can be used to make a solar filter. 
> THIS IS NOT SAFE!!  Such a
> filter does not block all the dangerous UV
> wavelengths.
> Clear skies
> Don
> 
> -----Original Message-----
> From: atm-bounces at atmlist.net
> [mailto:atm-bounces at atmlist.net] On Behalf Of
> franck griere
> Sent: Monday, April 16, 2007 1:20 PM
> To: atm at atmlist.net
> Subject: Re: [ATM] Lyot Plate
> 
> hello, look this link from Wolfgang Rhor
>
http://www.astro-foren.de/showthread.php?t=4656&highlight=rauhheits+test
> 
> franck griére
> 
> ----- Original Message ----- 
> From: "Tom Glinos" <tg at utstat.toronto.edu>
> To: <atm at atmlist.net>
> Sent: Monday, April 16, 2007 8:14 PM
> Subject: Re: [ATM] Lyot Plate
> 
> 
> >
> > Dale:
> >
> > Can you post a picture of your plate somewhere?
> > Does the plate face the mirror or the camera.
> >
> > tom
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
> 
> 
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